Improvement in steam-pumps



ran STTE WAI/DEB W. GILBERT, OF NEW YORK, N. Y.

IMPROVEMENT ml STEAM-PPUMPS.

specification forming part of Letters Patent No. 973%), dated November 30, 1869; antedated No vember 24, 1869.

' To all whom t't may concern:

Be it known that I, WALTER W. GILBERT, of New York, in the county of New. York and State of New York, have invented a new and useful Improvement in Steam-Pumps;and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and .usetheisarne, referencebeing had to the accompanying drawings, forming part of this specification.

This invention relates to improvements in steam-pumps, and has for its obj ect to provide certain improvements in. the arrangement of the 'steamf'piston, for cheapening the construction and simplifying the adaptation of the same forusein opening, and'closing the ports of a, steamactuatedpiston-vali'e; also, to provide certain improvements in the construction 'of the pump-valves.

Figure 1. represents a longitudinal sectional elevation, of my improved pump, taken on the line aa; of Fig. 2; and -I ig. 2 represents-a transverse section of the same, taken on the line 3 3 of Fig. 1.

Similar lettens of reference indicate corresponding parts.

In an application fora patent for improve. ments in'st-eam-pumps heretofore filed by me, and now pending, I have described and shown an application to' the steam-piston of a bar or pro ectlon from; one end, for covering one of the pistonwalve'port's until near. the end of the movement of thesteam-pistonin onedirection.

,In practice I find it more ditficult and" expensiveto construct the pistons with these' projections than to extend the pistons wholly and the object of that part of this invention.

relating to the steam-piston is to provide this construction, coupled with an improved 'arrangement for. exhausting from the valve-cyh.

inder, V

v To accomplish-this, instead of leading the valve portsfrom near one end .ofthe steamcylinder, asin that case above referred to, I arrange them near the center, but lapping by each other, as represented in dotted lines at a b, and I make the piston nearly half the length ,of the cylinder, so that when the piston arrives near to the end of its movement to the right it will uncover port a, admitting steam to the end 0 of the valve tomove it to the left, and when the steam-piston arrives near the end of the opposite movement it similarly uncovers port I), admitting steam to the end d of the valve.

For exhausting from the valve-cylinder, I have in-this case provided the grooves or passages e f in the-steam-pi ston, which are opened alternately to the ports a b, as follows:

When the steam-piston arrives at the end of themovement to the right and the port a is opened to the live steam, the end of the pas- 'sage f will coincide with port b. and open a free passage from the-end d of the valvecylinderto the exhaust side of the steam-piston, and when thereve'rse movement of the piston ;takes place the passage 0 is similarly opened to port f. 1 This arrangement of. the steam-pistonadmits of its being fitted up with much less cost, by turning in a lathe, and providing the passages e f, saving the more expensive fitting of the said extension, and the space required for it in the cylinder or a stuffing-box in the cylinder-head for it to work; through.

My invention in the pump-valves consists in ponstriictin'g them in the cylindrical form represented at A B, and their concave slotted also arranged relatively to the said ports a b-,

all substantially as specified.

2. The cylindrical pump-valves A B and I concave slottedseats" O 1), arranged substantially as specified. I

The above specification of my invention signed by me this 12th. day of April, 1869.

WALTER W. GILBERT.

Witnesses FRANK BLocKL-EY, ALEX. F. ROBERTS. 

